The Peel District School Board says they are “deeply saddened” after four people between the ages of 15 and 19 were killed in a crash early Saturday morning in the town of Puslinch, Ont. In a statement to CTV News, officials confirmed that one of those killed in the incident was a current student with the school board and two were former students. “We are deeply saddened by the deaths of four young people in this collision, including one current and two former Peel District School Board students,” officials said. “We extend our heartfelt condolences to the families and friends of all four young people. Our thoughts are also with the two young people who were injured, and their families and friends. We are providing supports to students, their families, and staff for as long as it is needed.” The single-vehicle collision happened at approximately 1:35 a.m. Provincial police said the vehicle was travelling along Watson Road South when it smashed through a guard rail, crashing into a ravine below At the time of the crash, police said there were six people inside the vehicle. Four of them were pronounced dead at the scene. At a press conference Sunday morning, OPP said a 19-year-old man from Mississauga, 19-year-old man from Brampton, 17-year-old girl from Mississauga and 15-year-old girl from Milton were killed. A 17-year-old girl remains in hospital with life-altering injuries, while a 16-year-old girl sustained non-life-threatening injuries. Both are from Mississauga, police said. Insp. Karen Medeiros of the Wellington County OPP called the incident an “unimaginable loss.” “Four young people have lost their lives, in a matter of moments,” she said. “Families have been forever changed, and an entire community is searching for answers. Our responsibility is to ensure those answers are based on evidence, facts and a thorough investigation. That work will continue in the days and weeks ahead.” Investigators are still working to determine the cause of collision, and anyone with information or dash-cam of the incident are being asked to contact the OPP the Wellington County detachment at 1-888-310-1122. With files from CTV News Kitchener’s Jennifer K. Baker